Earthquake with magnitude of Md 2.5 on date 02-02-1987 and time 16:50:30 (Italy) in region 2 km NE Cascia (PG)

A magnitude Md 2.5 earthquake occured in region: 2 km NE Cascia (PG), on

  • 02-02-1987 15:50:30 (UTC)
  • 02-02-1987 16:50:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.73, 13.03 at 5 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cascia PG 2 3217 3217
Poggiodomo PG 8 117 3334
Norcia PG 8 4957 8291
Monteleone di Spoleto PG 11 599 8890
Cerreto di Spoleto PG 13 1075 9965
Vallo di Nera PG 14 364 10329
Sant'Anatolia di Narco PG 16 564 10893
Preci PG 16 724 11617
Scheggino PG 16 461 12078
Cittareale RI 17 482 12560
Accumoli RI 18 667 13227
Sellano PG 19 1079 14306
Leonessa RI 20 2435 16741

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
37 Km NE of Terni (111501 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
56 Km W of Teramo (54892 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
84 Km E of Viterbo (67173 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
88 Km N of Tivoli (56533 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.5 1987-02-02
15:50:30
42.73 13.03 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 40259
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-02-02 15:50:30 ± 0.196
Latitude 42.73 ± 0.01
Longitude 13.03 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 40259

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1710.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00356
Epicentral distance of station farthest from the epicenter (degree) 0.01052
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 40259
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:40:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-02-02T15:50:58.50 10.0 undecidable manual SG 355 0.0069 0.52 0.4
--.SD1.Z. 1987-02-02T15:50:54.50 10.0 undecidable manual PN 150 0.0105 1.02 0.2
--.AM8.Z. 1987-02-02T15:50:50.35 10.0 undecidable manual PG 27 0.0082 1.25 0.1
--.RMP.Z. 1987-02-02T15:50:49.50 10.0 undecidable manual PG 195 0.0086 -0.34 1.1
--.AQU.Z. 1987-02-02T15:50:48.50 10.0 undecidable manual SG 144 0.0042 0.11 0.6
--.CM8.Z. 1987-02-02T15:50:47.97 10.0 undecidable manual SG 10 0.0041 -0.41 0.8
--.ASS.Z. 1987-02-02T15:50:46.50 10.0 undecidable manual SG 320 0.0038 -0.63 0.5
--.ARV.Z. 1987-02-02T15:50:46.50 10.0 undecidable manual PG 355 0.0069 0.13 1.4
--.ALP.Z. 1987-02-02T15:50:45.36 10.0 undecidable manual SG 83 0.0036 -0.49 0.7
--.AQU.Z. 1987-02-02T15:50:40.50 10.0 undecidable manual PG 144 0.0042 -0.33 1.4
--.CM8.Z. 1987-02-02T15:50:40.82 10.0 undecidable manual PG 10 0.0041 0 1.6
--.ASS.Z. 1987-02-02T15:50:39.80 10.0 undecidable manual PG 320 0.0038 -0.3 1.4
--.ALP.Z. 1987-02-02T15:50:38.99 10.0 positive manual PG 83 0.0036 -0.38 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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